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Mirrors > Home > MPE Home > Th. List > funcnv0 | Structured version Visualization version GIF version |
Description: The converse of the empty set is a function. (Contributed by AV, 7-Jan-2021.) |
Ref | Expression |
---|---|
funcnv0 | ⊢ Fun ◡∅ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fun0 6201 | . 2 ⊢ Fun ∅ | |
2 | cnv0 5792 | . . 3 ⊢ ◡∅ = ∅ | |
3 | 2 | funeqi 6158 | . 2 ⊢ (Fun ◡∅ ↔ Fun ∅) |
4 | 1, 3 | mpbir 223 | 1 ⊢ Fun ◡∅ |
Colors of variables: wff setvar class |
Syntax hints: ∅c0 4141 ◡ccnv 5356 Fun wfun 6131 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1839 ax-4 1853 ax-5 1953 ax-6 2021 ax-7 2055 ax-9 2116 ax-10 2135 ax-11 2150 ax-12 2163 ax-13 2334 ax-ext 2754 ax-sep 5019 ax-nul 5027 ax-pr 5140 |
This theorem depends on definitions: df-bi 199 df-an 387 df-or 837 df-3an 1073 df-tru 1605 df-ex 1824 df-nf 1828 df-sb 2012 df-mo 2551 df-eu 2587 df-clab 2764 df-cleq 2770 df-clel 2774 df-nfc 2921 df-ral 3095 df-rex 3096 df-rab 3099 df-v 3400 df-dif 3795 df-un 3797 df-in 3799 df-ss 3806 df-nul 4142 df-if 4308 df-sn 4399 df-pr 4401 df-op 4405 df-br 4889 df-opab 4951 df-id 5263 df-xp 5363 df-rel 5364 df-cnv 5365 df-co 5366 df-fun 6139 |
This theorem is referenced by: f10 6425 pthdlem1 27122 0trl 27529 0pth 27532 |
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